"There is a severe shortage of studies in the most biodiverse tropical and subtropical regions of the world. Birds have been the most frequently studied taxon, followed by mammals and plants, while non-insect invertebrates such as arthropods, molluscs and sponges, were only seldom assessed. Only 4% of the studies evaluated species’ vulnerability at a global scale, while more than 60% of the assessments were developed at a local scale."